While I have no time for these radical Muslims, remember that many nations (including the UK) have used terror and murder as part of their history.
Look at the use of Agent Orange by the USA in Vietnam in the 1960s.
Agent Orange was sprayed on trees and other foliage to remove the canopy of trees the Vietnamese were hiding under.
But it had caused huge problems since the Vietnam war with thousands of deformed children being born and so on.
More here
http://www.dailymail.co.uk/news/article-2401378/Agent-Orange-Vietnamese-children-suffering-effects-herbicide-sprayed-US-Army-40-years-ago.html
In fact you can sometimes understand why some of these people hate "the West" as we have been pretty awful to some of these "poorer" countries in the last 100 years or so.
Some of the activities of "the West" are shocking, like the overthrow of governments we did not like, such as the invasion of Grenada because a person we did not like had taken control.
http://en.wikipedia.org/wiki/Invasion_of_Grenada
There are plenty other examples of how we in the "the West" have used our power and our weapons to have control over other countries.
So while I don't condone anything these radical Muslims do (I hate them as much as you do) we cant sit back and pat ourselves on the back at how wonderful we have been in the recent past.